Chuck



F. W. KUPKE.

cHucK.

Patented July 5, 19210 mame@ im if? n www FRIEDRICH WILHELM KUPKE, OF GERA, REUSS, VGrEIBJIvANY.

CHUCK.

resinas.

Application filed June 28,

To @ZZ/0,071 om t may concern.'

Be it known that l, Fninnniorr WILHELM Kurkn, a citizen ot thevlepublic ot' Germany, residing at 21 Frbelstrasse, Gera, Reuss, Germany, have invented new and useful lmprovements in Chucks. for which have iiled an application in Germany June 1S, 1919, of which the following is a specilication.

rEhe acting might present invention relates to a self; chuck 'or a drilling machine, which be constructed as a irusto-conical chuck, having a threaded Spindle, that screws into the body portion oit the chuck.

ln known chucks ot this Atype generally the disadvantage Y is encountered that a change of the gripping tension or force will be followed by a change of the total length ot' the chuck. Besides, these chucks show the further drawback in the event of the drill being inserted in the jaw guide, that the working pressure tending to shorten the length of the chuck, will lead to a loosening of the tool. It, on the other hand the drill is introduced into the head of the threaded spindle proper, difficulties will arise in respect to positively guiding the jaws.

The present invention obviates these drawbacks by guiding the gripping jaws horizontally by the body of the chuck and inclined by the head of the threaded spindle adapted for the reception of the drill or the like. ping` jaws positively by pairs of elements and to obviate a change in the length of the chuck, when the force of the tension changes; as well as to make use of the features, which have proven efficient so far in known chucks.

ln the drawing a mode of construction of the chuck is shown in longitudinal section,V viz. in

Figure 1 with jaws open, and

Fig. 2 with the jaws entirely closed.

Figs. 3 and l are bottom plan views of the chuck.

rllhe chuck consists of the body portion A to be lined to the spindle of the drilling machine, into which the jaw carrier C is sunk and held by means of the wire lock H, the jaw carrier resting against one of the ball bearings B. rl`he gripping jaws D engage in horizontal notches of the jaw carrier, said gripping jaws being held in position by the inclined recesses in the jaw guide E,

Specification of Letters Patent.

rl`hus it is possible to guide the grip- Patented July 5, 192i.

1920. Serial No. 392,422.

which toward vits upper end forms the threaded spindle.

rEhe gripping jaws D are held together bythe socket lf which rests against the aw guide E, and is screwed up tightly with the guiding ring G surrounding the body portion of the chuck. The ring G has an annular recess at the end of its threading to receive an overhang-ing rim M of the flange L of the guide aw E, and such rim is held in said recess by the socketF which is screwthreadedly connected with the threaded portion ofthe ring G. By this means the aw guide E is maintained in its original form and changes in the jaw guide slots are preyented. rlhe shifting of the guiding ring in respect to the body of the chuck is limited on the one hand by a stop K and on the other hand by the jaws abutting against each other when closing the chuck. rlihe jaws l) are held together by a wire ring J passing through them. rlhis ring lies within a recess in the lower conical portion of the jaw guide E. The Vfunction of the device shown is as follows:

The drill inserted in the bore of the jaw guide E is prevented from becoming dislodged, by turning the guiding ring G by hand. This is elected in such a manner, that the threaded spindle oi' the jaw guide E is screwed into the body A of the chuck, owing to which the guiding ring G, the socket F and the jaw guide E are moved upward along the body of the chuck. The gripping aws, however, maintain their unchanged distance from the body A of Athe chuck or the drilling machine spindle,

respectively. After provisionally clamping the drill by hand, working with the tool may be commenced.

During the operation, the resistance of the drill exerts a further thrust through the gripping jaws D upon the jaw guide E and in consequence a further screwing of the thread into the body A of the chuck and tightening of the drill takes place. @n the other side loosening of the drill is effected by hand by rotary movement of the guiding ring G in a reverse sense.

What I claim is:

l. ln a. shelf-acting chuck the combination of a threaded spindle screwing into the body-portion of the chuck, with gripping jaws and means for guiding the jaws .llOrzontally by the body of the chuck and inclined by the head ot' the threaded spindle.

'2. In a selfacting chuck the combination of a threaded spindlescrewing into the body.- portion of the chuck, with gripping jaws held by a jaw carrier Arotatably mounted on the body-portion and means fory guiding the jaws horizontally by the body of the chuck and inclined by the head of the threaded spindle. j

3. In a self-acting chuck the combination of a threaded spindle screwing into the bodyportion of vthe-chuck, with gripping jaws held by a jaw carrier sunk intol the body portien and resting against a ball bearing and means for guiding the jaws horizontally by theV body of the chuck and inclined by the hea'd'of the threaded spindle. Y

4. 'In a self-acting chuck the combination of a threaded spindle screwing into the body-portion of the chuck, with gripping jaws guidedhorizontally by ajaw carrier rotatably mounted on the body portion and means for guiding the jaws inclined by the head of the threaded spindle.V

45'. In a self-acting chuck the combination ot a threaded spindle screwing into the body-portion of the chuck, with lgripping jawsY guided horizontally by ajaw 'carrier rotatably-mounted on the body portion and slots in the head of lthe threaded spindle Y' for obliquely guiding the jaws.

6. In a self-acting chuck the combination of threaded lspindle screwing intol the body-,portion ofk the chuck, with gripping jaws guided horizontally by a jaw carrier Y rotatably mounted on the body portion and slots in thei'head of the threaded spindle for obliquelyguiding the jaws held together by` a socket which rests against jawrguide and Yis screwed up tightly withl a guiding ring surrounding the body portion of the chuck. f j

7. In a self-acting chuck, theV combination of a body portion, a slotted jaw guide having a threaded spindle engaging said body portion andV a 'ring yon said body portion; withV gripping jaws guided in the slots of said guide, a socket screw-threadedly .con-` aving a recess at: its end 5` with gripping' jaws guided in the slots of SaidA guide a Y socket screwlthreadedly connected to said` ring, and a flange on the guide having a rim seating in. the recess on said ring and held therein by said socket. Y L

In testimony .whereof'I have signed my name in the presence of two witnesses.`V Y

Y FRIEDRICH ,WILHELM iVKVPKE. Y i Witnesses: j

` AALBERT STRIQKERT,

RICHARD BCHNER. 

